Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$39.9M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$39M |
| 3 |
Mastercard
MA
|
+$31.3M |
| 4 |
Apple
AAPL
|
+$25.3M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$25.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
JPMorgan Chase
JPM
|
+$52.8M |
| 2 |
TSMC
TSM
|
+$43M |
| 3 |
Amazon
AMZN
|
+$24.7M |
| 4 |
iShares Silver Trust
SLV
|
+$24.2M |
| 5 |
Netflix
NFLX
|
+$21.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 0.65% |
| 2 | Technology | 0.37% |
| 3 | Healthcare | 0.33% |
| 4 | Industrials | 0.21% |
| 5 | Communication Services | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1176
CALL
FuelCell Energy
FCEL
$1.86B
| $3.89M | 0.01% |
116
+69
| +147% | +$11.3K |
|
1177
PUT
Realty Income
O
$60.4B
| $3.88M | 0.01% |
645
+37
| +6% | +$2.19K |
|
1178
PUT
Oneok
OKE
$58.7B
| $3.88M | 0.01% |
1,012
+17
| +2% | +$572 |
|
1179
CALL
Inovio Pharmaceuticals
INO
$83.9M
| $3.88M | 0.01% |
366
-529
| -59% | -$70.4K |
|
1180
CALL
Cinemark Holdings
CNK
$3.82B
| $3.87M | 0.01% |
2,223
+1,586
| +249% | +$19.9K |
|
1181
GSK
GSK
$102B
| $3.87M | 0.01% |
84,126
+52,768
| +168% | +$2.42M |
|
|
AGNT
1182
CALL
AGNT Inc
AGNT
$636M
| $3.86M | 0.01% |
1,224
+852
| +229% | +$23.5K |
|
1183
CALL
Fastenal
FAST
$53B
| $3.86M | 0.01% |
1,582
-608
| -28% | -$14.3K |
|
1184
PUT
Editas Medicine
EDIT
$419M
| $3.86M | 0.01% |
550
+146
| +36% | +$6K |
|
1185
CALL
KeyCorp
KEY
$24.4B
| $3.86M | 0.01% |
2,350
+1,141
| +94% | +$16.6K |
|
1186
CALL
HubSpot
HUBS
$9.73B
| $3.85M | 0.01% |
97
-1
| -1% | -$351 |
|
1187
CALL
Service Corp International
SCI
$10.9B
| $3.83M | 0.01% |
781
+607
| +349% | +$28.8K |
|
|
AZPN
1188
CALL
DELISTED
ASPEN TECHNOLOGY INC
AZPN
| $3.82M | ﹤0.01% |
293
+276
| +1,624% | +$3.59M |
|
1189
CALL
Ovintiv
OVV
$17.3B
| $3.81M | ﹤0.01% |
2,657
+736
| +38% | +$8.62K |
|
1190
PUT
Boyd Gaming
BYD
$6.43B
| $3.81M | ﹤0.01% |
887
-372
| -30% | -$13.7K |
|
1191
PUT
EPAM Systems
EPAM
$4.5B
| $3.8M | ﹤0.01% |
106
+72
| +212% | +$24K |
|
|
COR
1192
CALL
DELISTED
Coresite Realty Corporation
COR
| $3.79M | ﹤0.01% |
303
+214
| +240% | +$26.5K |
|
1193
PUT
Ciena
CIEN
$57.7B
| $3.79M | ﹤0.01% |
718
-395
| -35% | -$17.6K |
|
1194
Domino's
DPZ
$10.7B
| $3.79M | ﹤0.01% |
9,891
+6,849
| +225% | +$2.69M |
|
1195
American Tower
AMT
$76.7B
| $3.79M | ﹤0.01% |
16,892
+14,250
| +539% | +$3.31M |
|
1196
PUT
Tradeweb Markets
TW
$21.3B
| $3.78M | ﹤0.01% |
606
-535
| -47% | -$32.3K |
|
1197
CALL
Ball Corp
BALL
$16.6B
| $3.78M | ﹤0.01% |
406
+138
| +51% | +$12.8K |
|
1198
PUT
Fair Isaac
FICO
$28B
| $3.78M | ﹤0.01% |
74
+65
| +722% | +$30.2K |
|
1199
PUT
Equifax
EFX
$19.6B
| $3.78M | ﹤0.01% |
196
+11
| +6% | +$1.85K |
|
1200
CALL
New York Times
NYT
$11.4B
| $3.77M | ﹤0.01% |
729
-274
| -27% | -$12.2K |
|
Similar funds
Simplex Trading's Q4 2020 Portfolio in Review
As of Q4 2020, Simplex Trading held 9,568 positions worth $77.2B, up 5% from $73.5B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading's Q4 2020 filing shows 1,711 new, 3,402 increased, 3,106 reduced and 1,157 closed positions. Its largest new stake was Alibaba: 143,630 shares worth $33.4M. The largest sale was JPMorgan Chase, an estimated $52.8M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 0.65% of assets, up from 0.53% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q4 2020 buy was Alibaba: 143,630 shares worth $33.4M.
- Simplex Trading added most to Invesco QQQ Trust in Q4 2020, an estimated $39M increase.
- Simplex Trading's biggest Q4 2020 reduction was JPMorgan Chase, cutting an estimated $52.8M.
- Simplex Trading fully exited Target in Q4 2020, selling an estimated $14.3M.
- Simplex Trading's ten largest holdings make up 42% of its $77.2B portfolio in Q4 2020.
- Simplex Trading opened 1,711 new positions and closed 1,157 in Q4 2020.
- Simplex Trading's portfolio value rose 5% quarter-over-quarter to $77.2B.
Based on Simplex Trading's 13F filing for Q4 2020, filed 2 Feb 2021.